html, body {
    margin:0;
    height: 100%;
}
body {
    display:table;
    width:100%;
}
.row-image, .row-texte {
    display:table-row;
}
.row-texte {
    height:100px;
    text-align: center;
}
.image {
    display:table-cell;
    vertical-align: middle;
    text-align: center;
}